مجال التميز  

تميز دراسي وبحثي وإبداع علمي  

البحوث المنشورة  

البحث (1): 

عنوان البحث: 

Effect of the anisotropic thermal conductivity of GDL on the performance of PEM fuel cells 

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تاريخ النشر: 

  3/07/2012 

موجز عن البحث: 

Gas diffusion layers (GDLs) are one of the main components in proton exchange membrane (PEM) fuel cells. In this paper, the effect of anisotropic thermal conductivity of the GDL is numerically investigated under different operating temperatures. Furthermore, the sensitivity of the PEM fuel cell performance to the thermal conductivity of the GDL is investigated for both in-plane and through-plane directions and the temperature distributions between the different GDL thermal conductivities are compared. The results show that increasing the in-plane and through-plane thermal conductivity of the GDL increases the power density of PEM fuel cells significantly. Moreover, the temperature gradients show a greater sensitivity to the in-plane thermal conductivity of the GDL as opposed to the through-plane thermal conductivity. 

البحث (2): 

عنوان البحث: 

The in-plane thermal conductivity and the contact resistance of the components of the membrane electrode assembly in proton exchange membrane fuel cells 

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تاريخ النشر:

23/04/2013

موجز عن البحث:

Understanding the thermal properties of the materials which are used in a proton exchange membrane fuel cell (PEM) is essential for the thermal management of a PEM fuel cell and consequently for improving its performance. In this paper, the parallel thermal conductance technique (PTC) has been employed to obtain the in-plane thermal conductivity and the contact resistance of several components of the membrane electrode assembly (MEA). In addition, the effects of temperature, polytetrafluoroethylene (PTFE) loading, micro porous layer (MPL) coating and the fibre direction on the in-plane thermal conductivity of the gas diffusion layer (GDL) have been investigated. The in-plane thermal conductivity of the GDL was found to decrease with increasing temperature and increase slightly with increasing PTFE loading and MPL coating. Further, the in-plane thermal conductivity of the membrane increased with higher amounts of water in the membrane. The in-plane thermal conductivity of the catalyst layer was found to be insensitive to the temperature and it increased with platinum loading.

البحث (3):

عنوان البحث:

The through-plane thermal conductivity and the contact resistance of the components of the membrane electrode assembly and gas diffusion layer in proton exchange membrane fuel cells

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تاريخ النشر:

Accepted 14/07/2014

موجز عن البحث:

The thermal conductivity of the components of the membrane electrode assembly (MEA) and GDL must be accurately estimated in order to better understand the heat transfer processes in the proton exchange membrane (PEM) fuel cells. In this study, an experimental investigation has been performed to measure the through-plane thermal conductivity and the contact resistance for a number of gas diffusion layer (GDL) materials. The sensitivity of these quantities to the temperature, PTFE content and micro porous layer (MPL) coating has been undertaken. In addition, the through-plane thermal conductivity of the membrane has been measured and reported as a function of temperature and water content. Further, the through-plane thermal conductivity of the catalyst layer has been determined as a function of temperature and platinum loading. It has been found that the through-plane thermal conductivity of the components of the MEA decreases when the temperature increases, and the through-plane thermal conductivity of the GDL is significantly lower than its in-plane thermal conductivity.

المؤتمرات العلمية:

المؤتمر (1):

عنوان المؤتمر:

Fifth European Fuel Cell Technology & Applications Conference – Piero Lunghi Conference

تاريخ الإنعقاد:

مكان الإنعقاد:

Rome, Italy

طبيعة المشاركة:

Oral Presentation

عنوان المشاركة:

The through-plane thermal conductivity and the contact resistance of the components of the membrane electrode assembly in proton exchange membrane fuel cells.

ملخص المشاركة:

The thermal conductivity of the components of the membrane electrode assembly (MEA) must be accurately estimated in order to better understand the heat transfer processes in proton exchange membrane (PEM) fuel cells. In this study, an experimental investigation has been performed to measure the through-plane thermal conductivity and the contact resistance for a number of gas diffusion layer (GDL) materials. The sensitivity of these quantities to the temperature, PTFE content and micro porous layer (MPL) coating has been undertaken. In addition, the through-plane thermal conductivity of the membrane has been measured and reported as a function of temperature and water content. Further, the through-plane thermal conductivity of the catalyst layer has been determined as a function of temperature and platinum loading. It has been found that the through-plane thermal conductivity of the components of the MEA decreases when the temperature increases, and the through-plane thermal conductivity of the GDL is significantly lower than its in-plane thermal conductivity.

Index Terms – catalyst layer, gas diffusion layer, membrane,through-plane thermal conductivity.

المؤتمر (2):

عنوان المؤتمر:

4th European PEFC and H2 Forum 2013

تاريخ الإنعقاد:

مكان الإنعقاد:

Lucerne Switzerland

طبيعة المشاركة:

Oral Presentation

عنوان المشاركة:

Metal-based gas diffusion layer in proton exchange membrane fuel cells

ملخص المشاركة:

Gas diffusion layers (GDLs) in PEM fuel cells should be made from a high thermal conductivity and a high electrical conductivity material with uniform optimized pore sizes

In this paper, a three-dimensional multiphase model has been developed to investigate the effect of the metallic based GDL on the performance of PEM fuel cells. The copper and aluminium based GDLs have been compared with the conventional carbon paper based GDLs. The results show an increase in the power density of the PEM fuel cells when the metallic based gas diffusion layer has been used. In addition, the maximum temperature in the PEM fuel cell decreases when the metallic based GDLs have been used and the temperature gradient decreases due to the dissipation of the heat from the membrane electrode assembly. Moreover, using the metallic based GDL increases the liquid water saturation as the maximum temperature decreases, which is a result of the uniform temperature distribution.

المؤتمر (3):

عنوان المؤتمر:

European Fuel Cell – Piero Lunghi Conference & Exhibition

تاريخ الإنعقاد:

4-16/12/2011

مكان الإنعقاد:

Rome, Italy

طبيعة المشاركة:

Paper presentation

عنوان المشاركة:

The effect of anisotropic gdl on the performance of pem fuel cell

ملخص المشاركة:

Typically, gas diffusion layers (GDLs) in proton exchange membrane (PEM) fuel cells demonstrate an anisotropy in the thermal conductivity. In this study, an in-house PEM fuel cell was modelled and validated against experimental data. Subsequently the sensitivity of the fuel cell performance to the anisotropic thermal conductivity was investigated. The temperature gradient across the membrane electrode assembly (MEA) was found to decrease more with increase the in-plane thermal conductivity. The overall performance of the fuel cell was found to increase more with increasing the in-plane thermal conductivity. Likewise, the average local current density with the GDL was shown to increase with increasing the thermal conductivity of the GDL.

براءة إختراع:

نوع الإختراع:

Proton exchange membrane fuel cell

الجهة المسجلة:

Net Scientific Limited

تاريخ تسجيل الإختراع:

20/06/2013

ملخص عن الإختراع:

The invention relates to a proton exchange membrane fuel cell and a method of designing the same. A method of designing a proton exchange membrane fuel cell comprising a gas diffusion layer is described. The method comprises: using a model of the proton exchange membrane fuel cell to determine performance of the fuel cell, wherein the model is based on a plurality of parameters of the fuel cell, the plurality of parameters including at least one anisotropic property of the gas diffusion layer, adjusting at least one of the plurality of parameters; determining whether or not performance of the fuel cell is improved by the adjusting step and designing the fuel cell by selecting the parameters which provide improved performance. A proton exchange membrane fuel cell is also described comprising a gas diffusion layer, the proton exchange membrane fuel cell having a plurality of parameters, wherein the parameters are selected to provide substantially uniform temperature distribution across the gas diffusion layer

المؤتمر (3):

عنوان المؤتمر:

Fifth European Fuel Cell Technology & Applications Conference – Piero Lunghi Conference

تاريخ الإنعقاد:

مكان الإنعقاد:

Rome, Italy

طبيعة المشاركة:

Oral Presentation

عنوان المشاركة:

The through-plane thermal conductivity and the contact resistance of the components of the membrane electrode assembly in proton exchange membrane fuel cells

ملخص المشاركة:

The thermal conductivity of the components of the membrane electrode assembly (MEA) must be accurately estimated in order to better understand th heat transfer processes in proton exchange membrane (PEM) fuel cells. In this study, an experimental investigation has been performed to measure the through-plane thermal conductivity and the contact resistance for a number of gas diffusion layer (GDL) materials. The sensitivity of these quantities to the temperature, PTF content and micro porous layer (MPL) coating has been undertaken. In addition, the through-plane thermal conductivity of the membrane has been measured and reported as a function of temperature and water content. Further, the through-plane thermal conductivity of the catalyst layer has been determined as a function of temperature and platinum loading. It has been found that the through-plane thermal conductivity of the components of the MEA decreases when the temperature increases, and the through-plane thermal conductivity of the GDL is significantly lower than its in-plane thermal conductivity.

Index Terms – catalyst layer, gas diffusion layer, membrane,through-plane thermal conductivity.

المؤتمر (4):

عنوان المؤتمر:

4th European PEFC and H2 Forum 2013

تاريخ الإنعقاد:

مكان الإنعقاد:

Lucerne, Switzerland

طبيعة المشاركة:

Oral Presentation

عنوان المشاركة:

 Metal-based gas diffusion layer in proton  exchange membrane fuel cells

ملخص المشاركة:

Gas diffusion layers (GDLs) in PEM fuel cells should be made from a high thermal conductivity and a high electrical conductivity material with uniform optimized pore sizes

In this paper, a three-dimensional multiphase model has been developed to investigate the effect of the metallic based GDL on the performance of PEM fuel cells. The copper and aluminium based GDLs have been compared with the conventional carbon paper based GDLs. The results show an increase in the power density of the PEM fuel cells when the metallic based gas diffusion layer has been used. In addition, the maximum temperature in the PEM fuel cell decreases when the metallic based GDLs have been used and the temperature gradient decreases due to the dissipation of the heat from the membrane electrode assembly. Moreover, using the metallic based GDL increases the liquid water saturation as the maximum temperature decreases, which is a result of the uniform temperature distribution

المؤتمر (5):

عنوان المؤتمر:

THE 4th European Fuel Cell Conference and Exhibition

تاريخ الإنعقاد:

مكان الإنعقاد:

Rome, Italy

طبيعة المشاركة:

Paper presentation

عنوان المشاركة:

The effect of anisotropic GDL on the performance of PEM fuel cell

ملخص المشاركة:

Typically, gas diffusion layers (GDLs) in proton exchange membrane (PEM) fuel cells demonstrate an anisotropy in the thermal conductivity. In this study, an in-house PEM fuel cell was modelled and validated against experimental data. Subsequently the sensitivity of the fuel cell performance to the anisotropic thermal conductivity was investigated. The temperature gradient across the membrane electrode assembly (MEA) was found to decrease more with increase the in-plane thermal conductivity. The overall performance of the fuel cell was found to increase more with increasing the in-plane thermal conductivity. Likewise, the average local current density with the GDL was shown to increase with increasing the thermal conductivity of the GDL.

براءة إختراع:

نوع الإختراع:

Proton exchange membrane fuel cell

الجهة المسجلة:

Net Scientific Limited

تاريخ تسجيل الإختراع:

20/06/2013

ملخص عن الإختراع:

The invention relates to a proton exchange membrane fuel cell and a method of designing the same. A method of designing a proton exchange membrane fuel cell comprising a gas diffusion layer is described. The method comprises: using a model of the proton exchange membrane fuel cell to determine performance of the fuel cell, wherein the model is based on a plurality of parameters of the fuel cell, the plurality of parameters including at least one anisotropic property of the gas diffusion layer, adjusting at least one of the plurality of parameters; determining whether or not performance of the fuel cell is improved by the adjusting step and designing the fuel cell by selecting the parameters which provide improved performance. A proton exchange membrane fuel cell is also described comprising a gas diffusion layer, the proton exchange membrane fuel cell having a plurality of parameters, wherein the parameters are selected to provide substantially uniform temperature distribution across the gas diffusion layer.